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Tip of the Day
Language: C++
Expertise: Beginner
May 6, 1997

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Mixing cout statements with fprintf statements in the same code

Question:
Is it reliable to mix cout statements with fprintf statements in the same C++ code if cout.sync_with_stdio() is used? Does this create one single buffered file I/O stream?

Answer:
In general, there is no problem using fprintf and cout together in the same program. The function ios::sync_with_stdio is not standard to the C++ language streams library and is defined by a few PC platforms. Calling this function changes implementations of the predefined objects like cout cin cerr to use a stdiobuf instead of a filebuf.

There will be some perfomance degradation, because both the stdio and streambuf will be buffering the output.

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